There is a few things to be said on this subject here starting with, in my opinion [ along with others connected with Missing Persons investigations], that the number of unidentified human remains in the US are a massive ‘cold case.’ Notable in the attached Texas Tribune article is its’ mention that inter-agency communication is poor. I can attest to that amongst certain governmental entities.

Lack of Money Hinders Effort to ID Remains of Migrants Near the Border

“Shoestring budgets and bureaucratic hurdles are preventing some of the state’s top researchers and forensic experts from identifying hundreds of the remains found on or near the Texas border, members of the Texas Forensic Science Commission said Wednesday.”